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Cross-bridge kinetics in asynchronous insect flight muscle.

D C White1, J Lund, M R Webb

  • 1Department of Biology, University of York, UK.

Advances in Experimental Medicine and Biology
|January 1, 1988
PubMed
Summary
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Small strains significantly enhance calcium-activated insect flight muscle function. Oxygen exchange studies reveal a single ATP hydrolysis pathway in strained insect muscle, unlike rabbit muscle, suggesting myosin head distribution influences this mechanism.

Area of Science:

  • Muscle physiology
  • Biophysics
  • Biochemistry

Background:

  • Insect flight muscle activation is calcium-dependent.
  • Applied strain further enhances muscle activation.
  • The precise mechanism of strain activation remains unclear.

Purpose of the Study:

  • To investigate the mechanism of strain activation in insect flight muscle.
  • To elucidate the role of ATP hydrolysis pathways in strain-dependent muscle function.
  • To compare ATP hydrolysis patterns between insect and rabbit muscle.

Main Methods:

  • Chemically skinned fibers from Lethocerus indicus flight muscle were used.
  • Oxygen exchange between phosphate and water during ATP hydrolysis was measured.
  • Experiments were conducted at varying degrees of applied strain.

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Main Results:

  • Maximally activated insect fibers showed a single ATP hydrolysis pathway.
  • Unstrained insect fibers exhibited a more complex ATP hydrolysis pattern.
  • A narrow strain range, centered at rest length, triggered the transition to a simpler pathway.
  • Phosphate release from actomyosin appears rate-limiting in activated insect fibers.

Conclusions:

  • Strain significantly alters ATP hydrolysis pathways in insect flight muscle.
  • Myosin head distribution on the thick filament likely explains differences between insect and rabbit muscle.
  • The primary tension-generating state in activated insect muscle is likely an AM.ADP.Pi complex.